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A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be

A heat pump working on a reversed Carnot cycle has a C.O.P. of 5. It works as a refrigerator taking 1 kW of work input. The refrigerating effect will be Correct Answer 4 kW

C.O.P. (heat pump) = 1 + C.O.P. (R effect)    
5 = 1 + C.O.P. (R effect)
C.O.P. (R effect) = 5 - 1.
C.O.P. (R effect) = 4.

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